CN105187004A - Photovoltaic power generation reverse current protection device - Google Patents
Photovoltaic power generation reverse current protection device Download PDFInfo
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- CN105187004A CN105187004A CN201510610022.4A CN201510610022A CN105187004A CN 105187004 A CN105187004 A CN 105187004A CN 201510610022 A CN201510610022 A CN 201510610022A CN 105187004 A CN105187004 A CN 105187004A
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- terminal
- reverse current
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- photovoltaic panel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a photovoltaic power generation reverse current protection device comprising an anti-reverse-current electric box, a reverse current detection controller and an AC power grid. The anti-reverse-current electric box is provided with multiple terminals. An actuating element is installed between each pair of photovoltaic panel access terminals. Photovoltaic panels are connected on the photovoltaic panel access terminals. A reverse current detection meter is installed in the anti-reverse-current electric box. The reverse current detection controller is connected with the anti-reverse-current electric box. A current transformer is connected in series on the AC power grid. The current transformer is connected with the reverse current detection meter. According to the photovoltaic power generation reverse current protection device, a defect that a common protection device only can turn on and turn off all the photovoltaic panels can be overcome by the device, the number of the accessed photovoltaic panels can be fine-controlled, and thus utilization rate of the photovoltaic panels is maximized and utilization rate of the photovoltaic panels is enhanced by the aforementioned mode.
Description
Technical field
The invention belongs to the application automatically controlled at photovoltaic art, be specifically related to a kind of photovoltaic generation counter current protection.
Background technology
Grid-connected reverse current guard system is generally used for the reverse power protection function in photovoltaic plant, reverse power protection device is the important component part in " irreversible grid-connected system ", most of small-sized photovoltaic power station access electric pressure is the low voltage electric network of 0.4kV, basic is user side self-contained type's power-supply system, generate power for their own use there being the solar time, electric network source is used without the solar time, not to electrical network feed, like this, reverse power protection function becomes and effectively prevents photovoltaic system to electrical network feed, ensure the important means of whole system electrical network quality, and the photovoltaic inversion waveform of user side does not need very strictly to audit yet.
Cost of access can lowlyer increase the supporting dynamics of new forms of energy especially photovoltaic generation along with country gradually, and domestic grid-connected engineering increases gradually.
Country's industry specifies there is clear and definite technical requirement to photovoltaic access standard; in July, 2009; State Grid Corporation of China has printed and distributed the notice of " State Grid Corporation of China's photovoltaic plant access electric power network technique specifies (trying) "; define the general specification of photovoltaic plant access electrical network; regulation requires: when design of photovoltaic power station is irreversible synchronizing mode; reverse power protection equipment should be configured; when detecting that backward current exceedes 5% of specified output, photovoltaic plant should stop to power network line power transmission in 0.5 ~ 2s.So counterflow-preventing protective device is the indispensable part of photovoltaic plant.
Traditional reverse-current protection device can only singlely be opened, disconnected whole photovoltaic panel, only detects reverse current, when exceeding set point; photovoltaic panel is all cut off; use electrical network electricity instead, crossed certain hour, then photovoltaic panel is all thrown up; if the sun is still so prosperous; electricity is also above set point, cuts off whole photovoltaic panel again, and photovoltaic panel is when generating is powerful; but cut off by force, utilance declines.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of photovoltaic generation counter current protection, and this device can finely control the access quantity of photovoltaic panel, makes the utilance of photovoltaic panel reach maximization.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of photovoltaic generation counter current protection, comprising:
One counterflow-preventing electronic box, described counterflow-preventing electronic box is provided with some terminals, described terminal comprise IA ﹢ terminal, IA-terminal, IB ﹢ terminal, IB-terminal, IC ﹢ terminal, IC-terminal, UC terminal, No. 1 terminal and some to photovoltaic panel access terminal, between often pair of described photovoltaic panel access terminal, executive component is installed, described photovoltaic panel access terminal is connected with photovoltaic panel, reverse current detection table is installed in described counterflow-preventing electronic box;
One reverse current detection control device, described reverse current detection control device is connected with described anti-reverse current case with described No. 1 terminal by described UC terminal;
One AC network, in described AC network, string has current transformer, and described current transformer is connected with described reverse current detection table.
In a preferred embodiment of the present invention, described reverse current detection control device is made up of master element and man-machine interface.
In a preferred embodiment of the present invention, the kind of described executive component comprises contactor and noncontacting switch.
In a preferred embodiment of the present invention, the way of described photovoltaic panel is identical with the logarithm that described photovoltaic panel accesses terminal.
In a preferred embodiment of the present invention, described photovoltaic panel quantity is 6 tunnels.
The invention has the beneficial effects as follows: a kind of photovoltaic generation counter current protection of the present invention; this device overcomes that common protective device can only singlely be opened, the defect of disconnected whole photovoltaic panel; reverse current detection control device in device detected reverse current size within 2 second time; and order thereupon according to national regulation the access of reverse current percentage or cut out the way of corresponding photovoltaic panel; thus the access quantity of precise controlling photovoltaic panel; make the utilance of photovoltaic panel reach maximization, improve the utilance of photovoltaic panel.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of photovoltaic generation counter current protection.
Fig. 2 is a kind of reverse current detection control device theory diagram of photovoltaic generation counter current protection.
In accompanying drawing, the mark of each parts is as follows: 1, counterflow-preventing electronic box; 2, reverse current detection control device; 3, photovoltaic panel; 4, photovoltaic panel access terminal; 5, executive component; 6, current transformer; 7, master element; 8, man-machine interface; 9, reverse current detects table.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Refer to Fig. 1 and Fig. 2, the embodiment of the present invention comprises: a kind of photovoltaic generation counter current protection, comprising:
One counterflow-preventing electronic box 1, described counterflow-preventing electronic box 1 is provided with some terminals, described terminal comprise IA ﹢ terminal, IA-terminal, IB ﹢ terminal, IB-terminal, IC ﹢ terminal, IC-terminal, UC terminal, No. 1 terminal and some to photovoltaic panel access terminal 4, described UC terminal and described No. 1 terminal are for being connected described reverse current detection control device 2, and during this 2 short circuits, described executive component 5 closes, this device works, otherwise then described executive component 5 disconnects, photovoltaic system departs from grid-connected.
Be provided with executive component 5 between often pair of described photovoltaic panel access terminal 4, described executive component 5 is contactor or noncontacting switch.
Described photovoltaic panel access terminal 4 is connected with photovoltaic panel 3, and the number of described photovoltaic panel 3 is identical with the logarithm that described photovoltaic panel accesses terminal 4, and the quantity of photovoltaic panel 3 described in the present embodiment is 6 tunnels.
Reverse current detection table 9 is installed in described counterflow-preventing electronic box 1, according to the difference of size of current, described IA ﹢ terminal, described IA-terminal, described IB ﹢ terminal, described IB-terminal, described IC ﹢ terminal, described IC-terminal and described UC terminal also need to install wired nose, design (calculated) load capacity is 75KW, electric current 150A, 50mm is joined in suggestion
2cable, described line nose adopts 50mm
2line nose.
One reverse current detection control device 2, described reverse current detection control device 2 can detect reverse current size within 2 second time, and order thereupon according to national regulation the access of reverse current percentage or cut out the way of corresponding described photovoltaic panel 3.
Described reverse current detection control device 2 is connected with described anti-reverse current case 1 with described No. 1 terminal by described UC terminal, described reverse current detection control device 2 is made up of master element 7 and man-machine interface 8, described master element 7 is single chip microcomputer, data are delivered in single chip microcomputer by described reverse current detection table 9 in time, by sending instructions to described executive component 5 and described man-machine interface 8 after single chip microcomputer computing, thus photovoltaic system is entered and departs from grid-connected control, described man-machine interface 8 is also for setting the task of the parameter of various needs.
One AC network, in described AC network, string has current transformer 6, described current transformer 6 is connected with described reverse current detection table 9, the secondary line of described current transformer 6 and the described IA ﹢ terminal on described counterflow-preventing electronic box 1, described IA-terminal, described IB ﹢ terminal, described IB-terminal, described IC ﹢ terminal and described IC-terminal is corresponding connects.
When the reverse current detected when described reverse current detection table 9 during use exceedes upper limit set value, described executive component 5 disconnects photovoltaic panel 3 described in a road immediately, described reverse current detection control device 2 compares with set point again, if the reverse current that described reverse current detection table 9 detects is this set point super also, described executive component 5 disconnects photovoltaic panel 3 described in a road again, the reverse current detected until described reverse current detection table 9 lower than upper limit set value till;
If the reverse current that described reverse current detection table 9 detects is lower than lower limit set value, described executive component 5 closes photovoltaic panel 3 described in a road immediately, described reverse current detection control device 2 compares with this set point again, until the reverse current that described reverse current detection table 9 detects keeps steady-working state only between set bound.
Compared with prior art; a kind of photovoltaic generation counter current protection of the present invention; this device overcomes that common protective device can only singlely be opened, the defect of disconnected whole photovoltaic panel; reverse current detection control device in device detected reverse current size within 2 second time; and order thereupon according to national regulation the access of reverse current percentage or cut out the way of corresponding photovoltaic panel; thus the access quantity of precise controlling photovoltaic panel; make the utilance of photovoltaic panel reach maximization, improve the utilance of photovoltaic panel.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. a photovoltaic generation counter current protection, is characterized in that, comprising:
One counterflow-preventing electronic box, described counterflow-preventing electronic box is provided with some terminals, described terminal comprise IA ﹢ terminal, IA-terminal, IB ﹢ terminal, IB-terminal, IC ﹢ terminal, IC-terminal, UC terminal, No. 1 terminal and some to photovoltaic panel access terminal, between often pair of described photovoltaic panel access terminal, executive component is installed, described photovoltaic panel access terminal is connected with photovoltaic panel, reverse current detection table is installed in described counterflow-preventing electronic box;
One reverse current detection control device, described reverse current detection control device is connected with described anti-reverse current case with described No. 1 terminal by described UC terminal;
One AC network, in described AC network, string has current transformer, and described current transformer is connected with described reverse current detection table.
2. a kind of photovoltaic generation counter current protection according to claim 1, is characterized in that: described reverse current detection control device is made up of master element and man-machine interface.
3. a kind of photovoltaic generation counter current protection according to claim 1, is characterized in that: the kind of described executive component comprises contactor and noncontacting switch.
4. a kind of photovoltaic generation counter current protection according to claim 1, is characterized in that: the way of described photovoltaic panel is identical with the logarithm that described photovoltaic panel accesses terminal.
5. a kind of photovoltaic generation counter current protection according to claim 1, is characterized in that: described photovoltaic panel quantity is 6 tunnels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510610022.4A CN105187004B (en) | 2015-09-23 | 2015-09-23 | A kind of photovoltaic generation counter current protection |
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| CN201510610022.4A CN105187004B (en) | 2015-09-23 | 2015-09-23 | A kind of photovoltaic generation counter current protection |
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| CN105187004A true CN105187004A (en) | 2015-12-23 |
| CN105187004B CN105187004B (en) | 2017-11-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069798A (en) * | 2017-01-17 | 2017-08-18 | 陕西科技大学 | The control method and its system of distributed photovoltaic power generation system |
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| CN101958555A (en) * | 2010-08-31 | 2011-01-26 | 山东力诺太阳能电力工程有限公司 | Intelligent control system and method of photovoltaic grid-connected power station |
| CN202353229U (en) * | 2011-09-30 | 2012-07-25 | 天津永明新能源科技有限公司 | Grid-connected photovoltaic power supply reverse-power prevention device |
| JP2012182868A (en) * | 2011-02-28 | 2012-09-20 | Kyocera Corp | Photovoltaic power generator |
| CN102780233A (en) * | 2012-08-08 | 2012-11-14 | 中盛光电能源股份有限公司 | Large-scale distributed photovoltaic power station user-side grid countercurrent-preventive system |
| CN202978296U (en) * | 2012-11-29 | 2013-06-05 | 浙江永升新能源科技有限公司 | Photovoltaic inverter backflow prevention system |
| CN205081751U (en) * | 2015-09-23 | 2016-03-09 | 常熟市宏宇水电设备工程有限责任公司 | Photovoltaic power generation counter current protection device |
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2015
- 2015-09-23 CN CN201510610022.4A patent/CN105187004B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958555A (en) * | 2010-08-31 | 2011-01-26 | 山东力诺太阳能电力工程有限公司 | Intelligent control system and method of photovoltaic grid-connected power station |
| JP2012182868A (en) * | 2011-02-28 | 2012-09-20 | Kyocera Corp | Photovoltaic power generator |
| CN202353229U (en) * | 2011-09-30 | 2012-07-25 | 天津永明新能源科技有限公司 | Grid-connected photovoltaic power supply reverse-power prevention device |
| CN102780233A (en) * | 2012-08-08 | 2012-11-14 | 中盛光电能源股份有限公司 | Large-scale distributed photovoltaic power station user-side grid countercurrent-preventive system |
| CN202978296U (en) * | 2012-11-29 | 2013-06-05 | 浙江永升新能源科技有限公司 | Photovoltaic inverter backflow prevention system |
| CN205081751U (en) * | 2015-09-23 | 2016-03-09 | 常熟市宏宇水电设备工程有限责任公司 | Photovoltaic power generation counter current protection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069798A (en) * | 2017-01-17 | 2017-08-18 | 陕西科技大学 | The control method and its system of distributed photovoltaic power generation system |
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Address after: 215500 Jiangsu city of Suzhou province Changshou City Yushan High-tech Industrial Park No. 5 Taizhou Road Applicant after: Changshou City Hongyu Electric Power Engineering Company Limited Address before: 215500 Jiangsu city of Suzhou province Changshou City Yushan High-tech Industrial Park No. 5 Taizhou Road Applicant before: CHANGSHU HONGYU HYDROELECTRIC EQUIPMENT ENGINEERING CO., LTD. |
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Inventor after: Wang Weiping Inventor after: Shi Dingliang Inventor before: Wang Weiping |
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